Hello,
If the full ubuntu installer is not booting correctly and you are unable to use the mini.iso due to adapter issues, you can try this steps:
First of all check your BIOS/UEFI settings and ensure the boot order is correct. Then verify the integrity of the Ubuntu ISO file you downloaded. After that create a bootable USB drive using a tool like Rufus or Etcher ensuring that the settings are correct. If using EasyBCD check the configuration and make sure it points to the correct boot file. If this all fails try using different USB drive or different installation method such as using a DVD instead of a USB drive. I hope the information helps you.
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Did you fixed your issue? Is this was helpful for you?